Periodically, I am encountering a very sulfurous smell in my house (1945 construction, interior completely remodeled/renovated in 2012). It smells strongly of sewage.
The smell is strongest in the adjoining kitchen, which does have a bathroom above it.
However, I don't believe that the smell is related to the bathroom. Because of an unrelated problem (poor caulking around the upstairs tub leading to small water leaks into the kitchen ceiling), I have cut a small hole in the kitchen ceiling, basically directly underneath the bathroom. When I sniff around there, there's no sewage smell at all, so it's probably not a leaking toilet or anything.
In the corner cabinet in my kitchen, there is a persistent smell, but not as strong as the periodic smell I am encountering.
The connector to city sewage runs under my kitchen, in fact, directly under where that corner cabinet is. However, I've looked at the pipes in the basement/crawlspace, and cannot see any leaks, nor can I smell any sewage at all.
Finally, sometimes the smell isn't in the kitchen, but in the adjoining living room, which has absolutely no plumbing in any adjacent wall or above or below.
My question is: is there something I should worry about and pay a plumber to investigate, or is my dog just showing me her love?